EP 0243969 A2 19871104 - Process for alkylene oxide polymerization.
Title (en)
Process for alkylene oxide polymerization.
Title (de)
Verfahren zur Polymerisation von Alkylenoxiden.
Title (fr)
Procédé de polymérisation d'oxydes d'alcoylène.
Publication
Application
Priority
US 85891486 A 19860502
Abstract (en)
The molecular weight of polyalkylene oxides produced by the polymerization of a cyclic oxide in contact with a catalyst comprising the reaction product of a dihydrocarbyl zinc compound and a linear alkanediol in contact with a silica dispersion aid and nonionic surfactant in an inert diluent is controlled by the continuous addition of a very dilute solution of chain transfer agent having a pKa value of from 9 to 22 to the polymerizing mixture during the polymerization reaction at a carefully controlled rate so as not to terminate the polymerization reaction.
IPC 1-7
IPC 8 full level
C08G 65/02 (2006.01); C08G 65/04 (2006.01); C08G 65/12 (2006.01); C08G 65/26 (2006.01)
CPC (source: EP US)
C08G 65/04 (2013.01 - EP US); C08G 65/12 (2013.01 - EP US); C08G 65/269 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
US 4667013 A 19870519; AU 7227387 A 19871105; BR 8702151 A 19880209; CA 1279435 C 19910122; EP 0243969 A2 19871104; EP 0243969 A3 19881005; JP H0474370 B2 19921126; JP S62273227 A 19871127
DOCDB simple family (application)
US 85891486 A 19860502; AU 7227387 A 19870430; BR 8702151 A 19870430; CA 535504 A 19870424; EP 87106293 A 19870430; JP 10651687 A 19870501